Is there anything I can do to help investigate the issue? I have reverted 
my commit for the time being, and it's a difference like day and night.

On Sunday, December 3, 2017 at 12:36:16 AM UTC+1, Sam Tobin-Hochstadt wrote:
> I don't think the mutable/immutable issue should be as significant as it 
> seems here. Using the Any type shouldn't perform better the way you 
> describe, so we need to look more at what the actual contracts are doing.
> Sam

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